QUALITY CONTROL OF FERTILISERS - VALIDATION OF THE MICRO-NUTRIENTS ANALYSIS FROM THE INORGANIC FERTILISERS PUBLISHEDAdriana Elena GRIGORE, Carmen SÎRBU, T. CIOROIANU, Ioana OPRICĂ, Daniela MIHALACHE, Iulia ANTON
Romania’s accession to the European Union imposed the alignment of national legislation concerning the fertilisers with the European legislation. Thus, the internal normative acts regulating the trading of fertilisers and their quality control have been harmonized with the European ones by taking-up the full EC Regulation No 2003/2003. The official control of the conformity of the fertilizers to the requirements of the EC Regulation regarding the quality and composition is regulated by law no 238 from 07.12.2010 and performed by laboratories operating under SR EN ISO 17025:2005 standard, accredited by the national accreditation body – RENAR and notified to the European Commission. Thus, laboratories are required to appropriate measures to ensure that they are able to deliver the expected quality of the results, demonstrating their competence. This paper presents the validation of the iron analysis from inorganic fertilisers. Extraction and determination of iron by atomic absorption spectrometry are made under the methods 9.1. and 9.4. from Annex III of the EC Regulation No 2003/2003in the Laboratory for Testing and Quality Control of Fertilizers (accreditation certificate LI 673/2008) within the National Research and Development Institute for Soil Science, Agrochemistry and Environment Protection – RISSA Bucharest. The values obtained from the laboratory experiments, estimated by statistical calculation show that the results are within the confidence limits for the probability of 95%, both in terms of repeatability and exactness, thus the method is validated.
fertilisers, micro-nutrients, method, validation